#!/bin/bash
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# git-tp-sync - downloads the latest PO files from translationproject.org
#               and commits changes to your GIT repository.
#
# Copyright (C) 2007-2025 Karel Zak <kzak@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
declare -A TP_PROJECTS

# Define local directories and project names on TP.org
#
#  TP_PROJECTS[<dirname>]=<project>
#
TP_PROJECTS["po"]="util-linux"
TP_PROJECTS["po-man"]="util-linux-man"

URL="rsync://translationproject.org/tp/latest"

DRYRUN="false"
LANGS=()
DIRS=()

while [[ $# -gt 0 ]]; do
	case $1 in
	--dry-run)
		DRYRUN="true"
		shift
		;;
	--dir)
		DIRS+=("$2")
		shift
		shift
		;;
	--usage | --help)
		echo "$(basename "$0") [--dir <dir>] [--dry-run] [<lang> ...]"
		exit 0
		;;
	*)
		LANGS+=("$1")
		shift;
		;;
	esac
done

git rev-parse --is-inside-work-tree >/dev/null 2>&1 || {
	echo "Error: Not inside a Git repository." >&2
	exit 1
}

# default to all dirs defined by TP_PROJECTS
if [ ${#DIRS[@]} -eq 0 ]; then
	DIRS=( ${!TP_PROJECTS[@]} )
fi

function get_author {
	echo $(gawk 'BEGIN { FS=": " } /Last-Translator/ { sub("\\\\n\"", ""); print $2 }' "$1")
}

function get_revision {
	echo $(gawk 'BEGIN { FS=": " } /PO-Revision-Date/ { sub("\\\\n\"", ""); print $2 }' "$1" \
		| date '+%s' -f -)
}

function get_revision_orig {
	echo $(git show HEAD:"$1" \
		| gawk 'BEGIN { FS=": " } /PO-Revision-Date/ { sub("\\\\n\"", ""); print $2 }' \
		| date '+%s' -f -)
}

function git_commit {
	local POFILE="$1"
	local MSG="$2"
	local AUTHOR=$(get_author "$POFILE")

	git commit --author "$AUTHOR" -m "$MSG" "$POFILE"
}

function save_modified_files {
	local POFILENAME="$1"
	local PODIR="$2"
	local POFILE="${PODIR}/${POFILENAME}"

	printf " %s : %10s : " $PODIR $POFILENAME

	new_rev=$(get_revision "$POFILE")
	old_rev=$(get_revision_orig "$POFILE")

	if [ $new_rev -gt $old_rev ]; then
		if [ "$DRYRUN" = "true" ]; then
			echo " updated (ingore, dry-run)"
		else
			echo " updated"
			git_commit $POFILE "$PODIR: update $POFILENAME (from translationproject.org)"
		fi
	else
		echo " ok"
	fi
}

function git_files {
	local MODE="$1"
	local PODIR="$2"

	echo $(git ls-files $MODE "${PODIR}/*.po" \
		| gawk '/[[:alpha:]_\-]*\.po/ { sub(".*/", ""); print $0; }' \
		| sort)
}

function download_files {
	local PROJECT="$1"
	local PODIR="$2"

	echo -n " Dowloding from ${URL}/${PROJECT} ..."

	if [ ${#LANGS[@]} -eq 0 ]; then
		rsync  -Lrtz  "$URL"/"$PROJECT"/ "$PODIR"
	else
		for l in "${LANGS[@]}"; do
			rsync  -Lrtz  "$URL"/"$PROJECT"/"$l".po "$PODIR"
		done
	fi
	echo " done"
}

function update_project {
	local PROJECT="$1"
	local PODIR="$2"

	echo
	echo "== Syncing $PROJECT to $PODIR/ ==="

	download_files $PROJECT $PODIR

	PO_NEW=$(git_files -o $PODIR)
	PO_MOD=$(git_files -m $PODIR)

	for f in $PO_MOD; do
		save_modified_files $f $PODIR
	done

	for f in $PO_NEW; do
		git add "$PODIR/$f"
		git_commit "$PODIR/$f" "$PODIR: add $f (from translationproject.org)"
	done

	if [ -f "${PODIR}/LINGUAS" ]; then
		LINGUAS=$(find $PODIR"/" -name '*.po' -type f -printf '%P\n' | sed 's/\.po//g' | sort)
		echo "$LINGUAS" > "${PODIR}/LINGUAS"

		if [ "$(git ls-files -m "${PODIR}/LINGUAS")" = "${PODIR}/LINGUAS" ]; then
			if [ "$DRYRUN" = "true" ]; then
				echo ""${PODIR}/LINGUAS" needs update"
			else
				git commit -m "$PODIR: update LINGUAS list" "${PODIR}/LINGUAS"
			fi
		fi
	fi

	# cleanup
	git checkout -f "$PODIR"/ &> /dev/null
}

function regenerate_po_files {
	local PODIR="$1"

	if [ "$PODIR" = "po" ]; then
		if [  "${PODIR}/Makefile" ]; then
			return;
		else
			echo "== Updating $PODIR (be patient) =="
			make -C $PODIR update-po &> /dev/null
		fi
	elif [ "$PODIR" = "po-man" ]; then
		echo "== Updating $PODIR (be patient) =="
		make gen-poman-dist
	else
		echo "Unsupported $PODIR directory (skip update)"
		return;
	fi

	# ignore files where is only modified one line ("POT-Creation-Date")
	PO_IGNORE=$(git diff --numstat  $PODIR/*.po | gawk -v ORS=" " '/1[[:blank:]]1[[:blank:]]/ { print $3 }')
	if [ -n "$PO_IGNORE" ]; then
		git checkout -f $PO_IGNORE &> /dev/null
	fi

	if [ $(git ls-files -m "$PODIR" | wc -l) -gt 0 ]; then
		if [ "$DRYRUN" = "true" ]; then
			echo "${PODIR}: needs merge changes"
		else
			git commit -m "$PODIR: merge changes" $PODIR
		fi
	fi

	git checkout -f "$PODIR" &> /dev/null
}

for d in "${DIRS[@]}"; do
	update_project "${TP_PROJECTS[$d]}" "$d"
	regenerate_po_files "$d"
done
